Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874936 | Hexagonal, information encoding article, process and system | Donald G. Chandler, Eric P. Batterman | 1989-10-17 |
| 4848556 | Low power coin discrimination apparatus | Andrew L. Pester, Carl M. Stern | 1989-07-18 |